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Agapov, Vladimir; Schildknecht, Thomas; Akim, Efraim; Molotov, Igor; Titenko, Vladimir; Yurasov, Vasiliy (2006). Results of GEO space debris studies in 2004-2005. In: 57th International Astronautical Congress. Valencia, Spain, Oct. 2-6, 2006. Paris: International Astronautical Federation